Willis then changed his order — to alphabet soup, if you will. “Just get me a ‘W’ and that’ll give me all the warmth I need,” said Willis, who practiced Wednesday in shorts amid 61-degree weather.

The National Weather Service forecasts a high near 8 and a low of minus-17 for Sunday, with sunny skies giving way to clouds.

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In coach Jim Harbaugh’s three seasons, the 49ers (12-4) haven’t played in a game where the kickoff temperature was colder than 34 degrees (December 2012, New England). Lambeau Field is obviously no stranger to the cold (see: Ice Bowl, 1967 NFC Championship Game, minus-15 degrees).

Colin Kaepernick grew up a Packers fan, but playing at chilly Lambeau in January is not his ideal scenario. “I don’t think my dream was to play in freezing weather,” Kaepernick said. “But to be in the playoffs and have this opportunity, yes, it’s part of it.”

Harbaugh’s take on Kaepernick in the cold: “He’ll be fine. He played in (college at) Reno and they had cold-weather games there. Cold and windy.”

Kaepernick, who led Nevada past host Boise State in 2010 when temperatures dropped into the 20s, said of Sunday’s forecast: “You just have to block it out.” He doesn’t plan to wear a glove on his throwing hand.